<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .container{
            display: flex;
           flex-direction: row;
           justify-content: space-between;
        }
        .child  {
            width: 100px;
            height: 100px;
            background-color: pink;
            display: flex;
            justify-content: center;
            align-items: center;

        }

    </style>
</head>
<body>
    <div class="container">
        <div>
            <span class="child">测试</span>
        </div>
        <div>
            <span class="child">测试</span>
        </div>
        <div>
            <span class="child">测试</span>
        </div>
    </div>
    <div></div>
</body>
</html>